How to use the flowetl.operators.cluster_operator.ClusterOperator function in flowetl

)
        attach = AttachOperator(task_id="attach")
        analyze = AnalyzeOperator(
            task_id="analyze", target="{{ extract_table }}", pool="postgres_etl",
        )
        latest_only = LatestOnlyOperator(task_id="analyze_parent_only_for_new")
        analyze_parent = AnalyzeOperator(
            task_id="analyze_parent", target="{{ parent_table }}", pool="postgres_etl",
        )
        update_records = UpdateETLTableOperator(task_id="update_records")

        create_staging_view >> check_not_empty >> check_not_in_flux >> extract
        from_stage = extract

        if cluster_field is not None:
            cluster = ClusterOperator(
                task_id="cluster", cluster_field=cluster_field, pool="postgres_etl"
            )
            extract >> cluster
            from_stage = cluster
        from_stage >> [
            add_constraints,
            add_indexes,
        ] >> analyze >> attach >> latest_only >> analyze_parent
        attach >> [update_records, *get_qa_checks()]
    globals()[dag_id] = dag
    return dag